Hair plexus

Hair plexus is a term used in anatomy to describe a network of nerve fibers that surround the base of each hair follicle. This network of nerves allows for the sensation of hair movement, contributing to the sense of touch.

Structure

The hair plexus is formed by the wrapping of sensory nerve fibers around the base of each hair follicle. These nerve fibers are a type of free nerve ending, and they are highly sensitive to the movement of the hair. When the hair moves, these nerve endings generate an electrical signal that is transmitted to the brain, allowing the individual to perceive the sensation of touch.

Function

The primary function of the hair plexus is to detect the movement of hair. This is an important aspect of the sense of touch, as it allows individuals to detect the presence of small insects or other objects on the skin. The hair plexus also plays a role in the goosebump response, as the contraction of the arrector pili muscle in response to cold or fear can stimulate the nerve endings in the hair plexus.

Clinical significance

Damage to the hair plexus can result in a loss of sensation in the affected area. This can occur as a result of nerve injury, skin disease, or certain neurological disorders. In some cases, the hair plexus may be affected by neuropathy, a condition that causes damage to the peripheral nerves.

See also

• Nervous system
• Sensory system
• Hair follicle
• Arrector pili muscle